I have someone's Block in my garage, I hope the car is still alive.618 Blockcast C 20 904 03 DZ original stamp, never decked ,never molested.19N631196 by oil filter, very light stamp,, hard to make out the first character #6, but 6 fits the build time frame,the 31196 is there .bored .030, new freeze plugs, cam bearings, excellent cond.